Dzhankeldy Wind Power Project
Soils, Geology, Groundwater and Surface Water
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Soils, Geology, Groundwater and Surface Water 6.3.1 Geological Setting & Geomorphological Structure The majority of Uzbekistan territory (approximately 78.8%) consist of desert plains stretching from the north west to south east which are regions of Turan depression or Turan Platform . The plain area is presented by steppes, Kyzylkum and Karakum desert. The south eastern & eastern region (21.2%) of the country consist primarily of mountains. According to the Geotechnical Site Investigation report prepared by UzAssystem on behalf of ACWA Power (UzAssystem, 2021a), The multiple folded basement of the Turan Platform includes sedimentary, metamorphic and igneous rocks which belongs to the Uralo-Mongolian Late Paleozoic orogenic belt. Major ancient continental blocks are the Kazakh and Karakum- Tajik microcontinents separated by the Turkestanian paleo-oceanic structure. The latter originated by rifting during Late Proterozoic and closed progressively from the Ordovician through the Early Triassic. The last collision of both microcontinents followed the formation of a large nappe pile intruded by granite in the South of Uzbekistan and the formation of a Dzhankeldy 500MW Wind Farm ESIA Volume 2- Main Text, Tables & Figures 168 volcanic-plutonic belt in the North. A Late-Neogene-Quaternary secondary orogeny formed the present appearance of the territory. The south east part of the Turan Platform experienced the secondary orogenic process the same as in the Alpine fold beIt (Pamir). As a result of this secondary tectonic activity, a new orogenic belt - The Tien Shan Mountains was formed. 6.3.2 Seismicity of the Region According to the Geotechnical Site Investigation report, there are several seismically active zones in Uzbekistan due to the large tectonic deformation strike lines capable of generating earthquakes with a magnitude of M>7 (UzAssystem, 2021a). Several seismic zones are identified in western and central Uzbekistan which could have effect on the project area. This seismic zone include North-Kuldzhuktau-Turkestan and Predkyzylkum, South-Auminzatau-Aktau and South-Tyan-Shan seismic zones and these are dynamically influenced by South Tyan Shan Fault, Zaravshan Fault and Uchbash-Karshi Flexure Fault. The North-Kuldzhuktau-Turkestan seismic zone with an earthquake potential & magnitude of M>6.5 passes through the Project site (both western & eastern plots). Another seismic zone; the Predkyzylkum which has an earthquake potential with magnitude of M>5.5 also passes through the southern part of the Project area. Based on the above, the possible seismic activity which could affect the Project area is considered as M > 6.5. The table below shows the few earthquakes that has been recorded to occur close to the Project area with magnitude of M>5 and MSK-64 intensity degrees greater than 8. The location of these earthquakes in relation to the Project Site is presented in the figure below. Download 6.64 Mb. Do'stlaringiz bilan baham: |
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